Compressed H2
[Compressed] storage is the most mature hydrogen storage technology. The current near-term technology for onboard automotive physical hydrogen storage is 350 and 700 bar (5,000 and 10,000 psi) nominal working-pressure compressed gas vessels—that is, "tanks.".. [C]ompressed hydrogen typically is stored at near-ambient temperatures.
The utility vehicle Hyundai Nexo has three equal-size carbon tanks mounted under the boot floor and the rear seat hold a total of 6.33 kilos of hydrogen. The NEXO thus has the largest tank [capacity] of all available fuel-cell passenger cars and, thanks to an optimised drivetrain/power train, the longest range as well: 756 km [3] stored at 700 bars.
Compressed hydrogen can be transported by trucks in gas cylinders or gas tubes with pressures between 200 and 500 bar. Usually several cylinders or tubes are bundled to modules in a 20′ or 40′ container that is mounted on a trailer (tube trailer)...
A tube trailer with steel cylinders can store up to 25,000 liters of hydrogen compressed to 200 bar which amounts to around 420 kg of hydrogen.
Provaris
They provide compressed H2 shipping solutions, a presentation [1] states their tech;
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Stores, transports & delivers hydrogen in high purity gaseous form
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Minimal technical barriers, no boil off
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Avoids energy and capital-intensive processes, compression tech is simpler.
Recently Provaris obtained world's first design approval for compressed hydrogen carrier from [American Bureau of Shipping]. Their maximum planned ship will have 120,000 m3 of H2 capacity. Let's calculate how much energy we could deliver assuming 40 trips / year and a fleet of 20 ships, using 250 bar H2 having 700 kwh/m3,
capacity = 120000 #m3
print ("Single ship %0.1f MW" % ((ship * 700) / (365*24*1e3)))
ann_trips = 40
print ("Fleet capacity %0.1f GW" % ((20 * ann_trips * capacity * 700) / (365*24*1e6)))
Single ship 9.6 MW
Fleet capacity 7.7 GW
References
[2] Wikipedia
[3] Hyundai H2 Live